I think it is possible, it only takes one of the virus cells to infect a normal cell in the human body, if, and I mean IF there is a chance for the bug to bite you and you shake it off half full and it bite someone else there may be one or two of the virus cells on the tuby thingys w/e ya wanna call them, once the tube is in you the virus cells try to infect other cells and so on. That is my theory... And there was someone who tried to prove that this happens....